Afrezza is dried human insulin produced in a lab from recombinant DNA*. The powder is placed into carrier particles (called Technosphere particles) that are so small that once inhaled they can reach your deep lungs, which have the surface area of about half the size of a tennis court. That’s right. A tennis court. Afrezza is absorbed into my blood stream rapidly, peaks in about 12-15 minutes and is out of my system in about 30-45 minutes. It’s so quick that I almost always start eating before I take my insulin. Instead of fast-acting, you can consider Afrezza to be ultra rapid and because of that it more closely mimics the post-meal functions of a person without diabetes.